How do vaccines create immune memory?
Vaccines aim to create memory cells by presenting target antigens without requiring severe disease.
Biological mechanism and regulation
Antigen presentation expands suitable B and T cells, some remaining as long-lived memory or antibody-producing cells. Later responses can be faster.
Evidence, applications and limits
Platforms may use weakened microbes, proteins, vectors or genetic instructions. Effectiveness varies with age, health, dosing interval and circulating variants. No single molecule or measurement explains the whole system; cell type, timing, environment and feedback must be considered together.
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